Plumbing double action pneumatic cylinders

by Larry Green
(Great Falls, MT USA)

I am looking to attach 6 individual double action cylinders to drawers in a cabinet. the drawer width will be approx 36" and the height will be 7 "...the depth (throw) of the cylinder will be approximately 14" max.


The total combined weight of the drawer will be approximately 14- 20#

I would also like to have these drawers on an open/close switch system for each individual drawer.

Drawer composition will be oak with aluminum framework to hold mechanisms in place.

Any help / recommended parts you could suggest would be great.

Thank you
Larry

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Hi Larry.

For information on sizing your double acting air cylinders see the air actuators page.

If the drawer slides are fixed and tight, you can get away with a fixed drawer to cylinder rod attachment. Otherwise, go with a rod clevis to attach the cylinder to the drawer.

There are many air operated valves which will allow you to toggle the drawer open and closed, too numerous to go into here.

You will want to use cylinder flow controls to control the speed of the cylinders. See more information on the flow controls page.

The rest is circuit design and parts specification. That I can do for you, but it's not free. If you want help, contact me through the contact form with your request, and I'll get back to you.

Cheers,

Bill



Comments for Plumbing double action pneumatic cylinders

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Dec 28, 2009
Thank you for the response Bill
by: Larry

hey Bill,
Thank you for your comments, No, I do understand that expertise is not free, however I am also looking for a value for money spent.
To design this system, I also need a parts list and supplier and also a parts list and diagram of assembly.
Since posting, I have been contacted by others on my email so I do need a "full meal deal" so to speak, if I have to do all the designing and pay for parts cost, not a problem. To have a designer just tell me what I have researched myself is of no value....what extra value can you offer me with your expertise?
Thank you for your response, please do not take business as a personal thing.
Larry

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Cushioning air cylinders

by Bill Rutherford
(Burley, ID)

Anybody have any experience with cushioning air cylinders on an RTO (Regenerative Thermal Oxidizer)? The rams move a large "valve" and has to be cushioning at both ends. It cycles approx every 200 sec. Our cylinders slam the valve on both ends and needs some cushioning.
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Bill, if the cylinders didn't come with internal cushions, you have a couple of options.

One is to use flow controls to slow the movement of the cylinder rod, without reducing force, and to allow the stroke to travel to the end without significant impact. That's a cheap solution if speed of valve operation isn't critical. See the page on flow controls for more info. Make sure you use a flow control and not a needle valve in the cylinder lines.

If speed is an issue and you cannot slow the cylinder with flow controls, then you can mount exterior shock absorbers to prevent end of stroke slamming. A number of companies make hydraulic shock absorbers for pneumatic applications, one of them being Enidine. They will provide support to you to help you choose the correct shock absorber(s) and mount(s) for your application.

Cheers,

Bill

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Aid cushioning cilinders

by Bob
(Holland)

Sketch of air cylinder and cylinder cushions

Sketch of air cylinder and cylinder cushions

I am a student mechanical engineer and i am trying to find design referencing about cushion design for pneumatic cylinders. I can't find any information about how to calculate a proper cushioning design. Could you give me some good advice?
Greets from holland.
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Bob, all of the major air component manufacturers - Norgren, Numatics, Festo, SMC, Bimba to name just a few - make cushioned air cylinders.

I am not an engineer. I know how the cushions on air cylinders work, and symptoms of why they don't, but I would only guess if you asked me to design a cylinder cushion spear and cavity that was the right size for a certain air cylinder or cylinder load.

You can certainly see the design of these cylinder cushions in the CAD drawings of their products from the manufacturers. Most provide CAD drawings so designers can drop their cylinder dimensions right into a drawing.

It would be to those folks I would turn for engineering help.

Cheers,

Bill

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